Using blogs for Personal Attacks

I'm not going to name any names, but just from browsing I have seen some of the most disgusting blogs. These blogs seem to have no purpose other than attacking a person or a group of people. They don't even try to be witty-scatalogical, crude and juvenile is the order of the day. What the motive is, I can't begin to guess, and frankly I don't want to know. It's just bizarre to me.